linux-kernel - Re: [PATCH -v3 0/6] rcu,nohz,kvm: use RCU extended quiescent state when running KVM guest

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Message-ID: <20150210031336.GO4166@linux.vnet.ibm.com>
Date:	Mon, 9 Feb 2015 19:13:36 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"borntraeger@...ibm.com" <borntraeger@...ibm.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"lcapitulino@...hat.com" <lcapitulino@...hat.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: Re: [PATCH -v3 0/6] rcu,nohz,kvm: use RCU extended quiescent state
 when running KVM guest

On Mon, Feb 09, 2015 at 10:03:08PM -0500, Rik van Riel wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> On 02/09/2015 10:01 PM, Paul E. McKenney wrote:
> > On Tue, Feb 10, 2015 at 02:44:17AM +0100, Frederic Weisbecker
> > wrote:
> >> On Mon, Feb 09, 2015 at 08:22:59PM -0500, Rik van Riel wrote:
> >>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
> >>> 
> >>> On 02/09/2015 08:15 PM, Will Deacon wrote:
> >>>> Hi Rik,
> >>>> 
> >>>> On Mon, Feb 09, 2015 at 04:04:38PM +0000, riel@...hat.com
> >>>> wrote:
> >>>>> Apologies to Catalin and Will for not fixing up ARM. I am
> >>>>> not familiar with ARM assembly, and not sure how to pass a
> >>>>> constant argument to a function from assembly code on ARM
> >>>>> :)
> >>>> 
> >>>> It's a bit of a faff getting enum values into asm -- we
> >>>> actually have to duplicate the definitions using #defines to
> >>>> get at the constants. Perhaps it would be cleaner to leave 
> >>>> context_tracking_user_{enter,exit} intact as C wrappers
> >>>> around context_tracking_{enter,exit} passing the appropriate
> >>>> constant? That way we don't actually need to change the arch
> >>>> code at all.
> >>> 
> >>> If Paul and Frederic have no objections, I would be happy to do
> >>> that.
> >>> 
> >>> Paul, Frederic?
> >> 
> >> Sure, that's fine by me.
> > 
> > And if it is fine by Frederic, it is fine by me!
> 
> I'll send a new series tomorrow that addresses Will's concern,
> as well as Paulo's latest suggestions.

Very good, thank you!

							Thanx, Paul

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